Edge-protected board



July 31, 1928.

J. SCHUMACHER EDGE PROTECTED BOARD Filed June 9, 192's 2 Sheets-Sheet 1A TTORNEYS.

July 31, 1928. 1,678,959

I J. SCHUMACHER EDGE PROTECTED BOARD Filed June 9. 1,526 2 Sheets-Sheet2 ATTORNEYS,

Patented July 31, 1928.

UNITED STATES JOHN SCHUMACHER, DE LOS ANGELES, CALIFORNIA.

EDGE-PROTECTED BOARD.

Application filed June 9, 1926. Serial No. 114,614.

This invention relates to a plaster board having a reinforced edgepartially covered. The core of plaster board is brittle so that, ifsubjected to rough usage in handling, it will crack and chip. An attempthas been made to overcome this objection by completely covering theplaster core at the edge with paper. For obvious reasons it has beenfound difiicult to effect a good bond between the paper at the edge andthe core. Furthermore, the paper does not provide as effective a surfacefor the adhesion of cement putty used at joints, as does the plasticcore it'- self.

The present invention has for its primary object the provsion of aplaster board having a partially exposed edge, the edge coveringproviding a reinforcement. Another object of this invention is theprovision of a plaster board having the edge partially covered byturning a cover sheet thereover and embedding it in the core. A furtherobject of this invention is to provide an edge of the characterdescribed which has recesses for the anchoring of adjacent boards.

These objects toegther with other objects and correspondingaccomplishments are obtained by means of the embodiment of my inventionillustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of a panel of one form of plaster boardembodying my invention; Fig. 2 is a perspective view of a panel ofplaster board of another form; Fig. 3 is a perspective view of amodification of the board shown in Fig. 1; and Fig. 4: is an end viewoffragments of adjacent panels of the form shown in Fig. 1.

Referring with more particularity to the drawing and especially to Fig.1, the plaster core of a wall board is indicated by 5. This core iscommonly formed of a gypsum composition well known in the art. On theface of the cores is a cover sheet 6, preferably of paper and endingflush with the edges of the board. The construction may be such that thecover sheet isfirmly bound to the plaster core. The particular method ofeffecting this bond is not pertinent to the present invention. However,it is the common practice of applicant to use a cover sheet which isslowly permeable to moisture. On the other face of the plaster core is acover sheet 7. This cover sheet is of a length greater than the panel sothat it may be turned over the edges thereof as indicated by 8. The endsof the cover sheets are then turned inwardly so as to be embedded in theplaster core. The portions 8 of the cover sheets are rounded and of suchdimensions that they preferably cover about one-half of the edge of theplaster core. The embedded portion serves to anchor the edge and also toprovide a reinforcement for the core at the edge. There is left anexposed portion of the plaster core indicated by 9. This portion willaid in the adhesion of the plaster cement which is used at the joints ofpanels in building up a wall. The cover sheet 7 is preferably formed ofpaper slowly permeable by moisture and placed in position while the coreis in its plastic state. An inset 10 is formed by removal of a portionof the plaster core. In abutting panels as shown in Fig. 4; plasterputty is inserted in the oint. This forms a connection 11 which whenhardened anchors the panels by reason of the protrusions disposed in theinsets.

Referring more particularly to Fig. 2, the

plaster core is indicated by 12. The upper and lower cover sheets areindicated by 13 .and 14. respectively. The upper cover sheet ends flushwith one edge of the board, and

the other edge is long so that it may be turned over to cover a portionas indicated by 15 and then embedded in the core. The lower cover sheetis turned over the edge as indicated by 16 and then embedded in thecore. The construction is such as to provide a partially covered edgeboard differing from the structure shown in Fig. 1, in that, the coversheets are both used for protecting the edges, one being used at oneedge and the other at the opposite edge. Another diiference is that theedge covering is angular in its bends and flat at the edge.

In Fig. 3 I' have shown a board with an edge covering similar to Fig. 1.However, the plaster core at the edge merges with the rounded coverwithout an inset being formed.

What I claim is:

1. A plaster board comprising a cementitious core, a cover sheettherefor having a.

margin extended over the edge in head form so as to partially cover theedge, an inset being formed at the juncture of the marginal ing an insetrecess in the edge face formed edge and core. With one Wall thereofincluding a portion of 2. A plaster board comprising a cenientisaidinturned margin. 10 tious core, a cover sheet therefor having a InWitness that I claim the foregoing I 5 margin extended over the edge soas to parhave hereunto subscribed my name this 2nd tially cover thesame, said margin being inday of June, 1926. turned and embedded in thecore, and hav- JOHN SCHUMACHER.

